Which of these relate most to the loudness of sound?
A) wavelength.
B) frequency.
C) speed.
D) amplitude.
E) all of the above
Answer: D
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Doppler Effect: You are driving along a highway at 25 m/s when you hear the siren of an emergency vehicle traveling at constant speed in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the speed of the vehicle? The speed of sound in air is 343 m/s.
A. 35 m/s B. 32 m/s C. 30 m/s D. 41 m/s E. 50 m/s
How do we know the Sun is in hydrostatic equilibrium?
A. It is not growing colder. B. It is not exploding. C. It is not collapsing. D. All of these choices are correct. E. None of these choices are correct.
Which are compact objects?
a. black holes b. neutron stars c. white dwarfs d. All of the other choices are correct.
Which of the following does NOT fall into the category of interplanetary debris?
A) comets B) Kuiper Belt bodies C) rings around the jovian planets D) Trojan asteroids E) meteoroids